QJ 303 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 303 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.14 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.007mm to 0
Outside diameter
47 mm
Outside diameter tolerance
-0.009mm to 0
Width
14 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1 mm
Distance from side face to load point
22 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
27.7 mm
Outer Ring Dimensions
Shoulder diameter outer ring
36.3 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
5265 lbf
Radial static load rating
3375 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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QJ 303 N2MA Bearing Product Overview & Core Advantages
The QJ 303 N2MA is a four-point contact ball bearing designed for applications requiring high precision and reliable performance under complex loading conditions. This single-row bearing excels at simultaneously handling radial loads and axial loads in both directions, making it an exceptionally compact solution. Manufactured to P6 (ABEC-3) tolerance class, it delivers high running accuracy and is pre-lubricated for immediate use, ensuring optimal performance in high-speed and high-rigidity applications.
QJ 303 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates snap ring grooves on the outer ring, facilitating secure axial location and simplified mounting within a housing. |
| MA | Signifies that the bearing is filled with a specific high-performance lubricating grease, providing long-term, maintenance-free operation. |
QJ 303 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The optimized raceway geometry allows a single-row bearing to support significant combined radial and bidirectional axial loads, offering a compact and lightweight design compared to traditional paired arrangements.
- High Precision & Rigidity: Built to P6 tolerance class with a brass cage, this bearing ensures high running accuracy, smooth operation, and stable rotational characteristics, which is critical for precision machinery.
- Simplified Installation: The inclusion of snap ring grooves (N2) on the outer ring allows for secure axial positioning, simplifying housing design and assembly processes.
- Maintenance-Free Operation: Pre-lubricated with a specialized grease (MA), the bearing is ready for immediate use and designed for long service life without the need for re-lubrication within its specified temperature range of -30° to 110 °C.
QJ 303 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications demanding high precision and the ability to handle complex loads. Key industries and equipment include:
- Precision Machine Tools: Rotary tables, indexing heads, and spindle support units.
- Robotics: Joints and actuators requiring compact, high-capacity bearings.
- Aerospace Actuation Systems: Control surface mechanisms and other high-reliability components.
- Medical Equipment: High-precision scanners and diagnostic instrument rotors.
- Industrial Pumps and Compressors: Where compact design and bidirectional axial load capacity are critical.
